1 /* 2 ** 3 ** Copyright 2008, The Android Open Source Project 4 ** 5 ** Licensed under the Apache License, Version 2.0 (the "License"); 6 ** you may not use this file except in compliance with the License. 7 ** You may obtain a copy of the License at 8 ** 9 ** http://www.apache.org/licenses/LICENSE-2.0 10 ** 11 ** Unless required by applicable law or agreed to in writing, software 12 ** distributed under the License is distributed on an "AS IS" BASIS, 13 ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 ** See the License for the specific language governing permissions and 15 ** limitations under the License. 16 */ 17 18 //#define LOG_NDEBUG 0 19 #define LOG_TAG "MediaMetadataRetriever" 20 21 #include <binder/IServiceManager.h> 22 #include <binder/IPCThreadState.h> 23 #include <media/mediametadataretriever.h> 24 #include <media/IMediaPlayerService.h> 25 #include <utils/Log.h> 26 #include <dlfcn.h> 27 28 namespace android { 29 30 // client singleton for binder interface to service 31 Mutex MediaMetadataRetriever::sServiceLock; 32 sp<IMediaPlayerService> MediaMetadataRetriever::sService; 33 sp<MediaMetadataRetriever::DeathNotifier> MediaMetadataRetriever::sDeathNotifier; 34 35 const sp<IMediaPlayerService>& MediaMetadataRetriever::getService() 36 { 37 Mutex::Autolock lock(sServiceLock); 38 if (sService.get() == 0) { 39 sp<IServiceManager> sm = defaultServiceManager(); 40 sp<IBinder> binder; 41 do { 42 binder = sm->getService(String16("media.player")); 43 if (binder != 0) { 44 break; 45 } 46 LOGW("MediaPlayerService not published, waiting..."); 47 usleep(500000); // 0.5 s 48 } while(true); 49 if (sDeathNotifier == NULL) { 50 sDeathNotifier = new DeathNotifier(); 51 } 52 binder->linkToDeath(sDeathNotifier); 53 sService = interface_cast<IMediaPlayerService>(binder); 54 } 55 LOGE_IF(sService == 0, "no MediaPlayerService!?"); 56 return sService; 57 } 58 59 MediaMetadataRetriever::MediaMetadataRetriever() 60 { 61 LOGV("constructor"); 62 const sp<IMediaPlayerService>& service(getService()); 63 if (service == 0) { 64 LOGE("failed to obtain MediaMetadataRetrieverService"); 65 return; 66 } 67 sp<IMediaMetadataRetriever> retriever(service->createMetadataRetriever(getpid())); 68 if (retriever == 0) { 69 LOGE("failed to create IMediaMetadataRetriever object from server"); 70 } 71 mRetriever = retriever; 72 } 73 74 MediaMetadataRetriever::~MediaMetadataRetriever() 75 { 76 LOGV("destructor"); 77 disconnect(); 78 IPCThreadState::self()->flushCommands(); 79 } 80 81 void MediaMetadataRetriever::disconnect() 82 { 83 LOGV("disconnect"); 84 sp<IMediaMetadataRetriever> retriever; 85 { 86 Mutex::Autolock _l(mLock); 87 retriever = mRetriever; 88 mRetriever.clear(); 89 } 90 if (retriever != 0) { 91 retriever->disconnect(); 92 } 93 } 94 95 status_t MediaMetadataRetriever::setDataSource(const char* srcUrl) 96 { 97 LOGV("setDataSource"); 98 Mutex::Autolock _l(mLock); 99 if (mRetriever == 0) { 100 LOGE("retriever is not initialized"); 101 return INVALID_OPERATION; 102 } 103 if (srcUrl == NULL) { 104 LOGE("data source is a null pointer"); 105 return UNKNOWN_ERROR; 106 } 107 LOGV("data source (%s)", srcUrl); 108 return mRetriever->setDataSource(srcUrl); 109 } 110 111 status_t MediaMetadataRetriever::setDataSource(int fd, int64_t offset, int64_t length) 112 { 113 LOGV("setDataSource(%d, %lld, %lld)", fd, offset, length); 114 Mutex::Autolock _l(mLock); 115 if (mRetriever == 0) { 116 LOGE("retriever is not initialized"); 117 return INVALID_OPERATION; 118 } 119 if (fd < 0 || offset < 0 || length < 0) { 120 LOGE("Invalid negative argument"); 121 return UNKNOWN_ERROR; 122 } 123 return mRetriever->setDataSource(fd, offset, length); 124 } 125 126 status_t MediaMetadataRetriever::setMode(int mode) 127 { 128 LOGV("setMode(%d)", mode); 129 Mutex::Autolock _l(mLock); 130 if (mRetriever == 0) { 131 LOGE("retriever is not initialized"); 132 return INVALID_OPERATION; 133 } 134 return mRetriever->setMode(mode); 135 } 136 137 status_t MediaMetadataRetriever::getMode(int* mode) 138 { 139 LOGV("getMode"); 140 Mutex::Autolock _l(mLock); 141 if (mRetriever == 0) { 142 LOGE("retriever is not initialized"); 143 return INVALID_OPERATION; 144 } 145 return mRetriever->getMode(mode); 146 } 147 148 sp<IMemory> MediaMetadataRetriever::captureFrame() 149 { 150 LOGV("captureFrame"); 151 Mutex::Autolock _l(mLock); 152 if (mRetriever == 0) { 153 LOGE("retriever is not initialized"); 154 return NULL; 155 } 156 return mRetriever->captureFrame(); 157 } 158 159 const char* MediaMetadataRetriever::extractMetadata(int keyCode) 160 { 161 LOGV("extractMetadata(%d)", keyCode); 162 Mutex::Autolock _l(mLock); 163 if (mRetriever == 0) { 164 LOGE("retriever is not initialized"); 165 return NULL; 166 } 167 return mRetriever->extractMetadata(keyCode); 168 } 169 170 sp<IMemory> MediaMetadataRetriever::extractAlbumArt() 171 { 172 LOGV("extractAlbumArt"); 173 Mutex::Autolock _l(mLock); 174 if (mRetriever == 0) { 175 LOGE("retriever is not initialized"); 176 return NULL; 177 } 178 return mRetriever->extractAlbumArt(); 179 } 180 181 void MediaMetadataRetriever::DeathNotifier::binderDied(const wp<IBinder>& who) { 182 Mutex::Autolock lock(MediaMetadataRetriever::sServiceLock); 183 MediaMetadataRetriever::sService.clear(); 184 LOGW("MediaMetadataRetriever server died!"); 185 } 186 187 MediaMetadataRetriever::DeathNotifier::~DeathNotifier() 188 { 189 Mutex::Autolock lock(sServiceLock); 190 if (sService != 0) { 191 sService->asBinder()->unlinkToDeath(this); 192 } 193 } 194 195 }; // namespace android 196
